계단을 구성하는 개별적인 한 단
A single step in a flight of stairs.
예문:
"She sat on the bottom stair to put on her shoes."
"The third stair from the top always creaks when you step on it."
층과 층 사이를 오르내릴 수 있게 만든 연속된 단
A series of steps for going from one level to another, typically inside a building.
예문:
"The spiral stairs lead up to the observation deck."
"He ran up the stairs to answer the door."
"The emergency stair is located at the end of the hallway."
2층 버스 등 대형 탈것 내부에 설치된 계단
The set of steps inside a vehicle, such as a double-decker bus, used to reach an upper level.
예문:
"Please hold the handrail while using the stair on the bus."
"The space under the stair is reserved for large luggage."